A random sample of 2,060 consumers shows that 13% prefer California wines. Over the next three months, an advertising campaign is undertaken to show that California wines receive awards and win taste tests. The organizers of the campaign want to prove that the three-month campaign raised the proportion of people who prefer California wines by at least 5%. At the end of the campaign, a random sample of 5,000 consumers shows that 19% of them now prefer California wines. Conduct the test at α = 0.05.
Answer to relevant QuestionsIn problem 8-32, give a 95% confidence interval for the increase in the population proportion of consumers preferring California wines following the campaign. In problem A random sample of 2,060 consumers shows that 13% ...According to USA Today, 32% of the public think that credit cards are safer than debit cards, while 19% believe that debit cards are safer than credit cards. If these results are based on two independent random samples, one ...The following data are independent random samples of sales of the Nissan Pulsar model made in a joint venture of Nissan and Alfa Romeo. The data represent sales at dealerships before and after the announcement that the ...According to a study reported in the New York Times, 48% of the viewers who watched NFL Football on TiVo viewed 1 to 6 commercials, while 26% of the viewers who watched Survivor: Cook Islands on TiVo viewed 1 to 6 ...The IIT Technical Institute claims "94% of our graduates get jobs." Assume that the result is based on a random sample of 100 graduates of the program. Suppose that an independent random sample of 125 graduates of a ...
Post your question